14,202 research outputs found
The initial involution patterns of permutations
No full texthttp://www.combinatorics.org/Volume_14/Abstracts/v14i1r2.htmlFor a permutation pi = pi(1)pi(2)... pi(n) is an element of S-n and a positive integer i <= n, we can view pi(1)pi(2)... pi(i) as an element of S-i by order-preserving relabeling. The j-set of pi is the set of i's such that pi(1)pi(2)... pi(i) is an involution in S-i. We prove a characterization theorem for j-sets, give a generating function for the number of different j-sets of permutations in S-n. We also compute the numbers of permutations in S-n with a given j-set and prove some properties of them
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometric observation of a peptide triplet induced by thermal cleavage of cystine
No full textHeat-induced (90 degreesC, 30 min) beta -elimination of a cystine residue leads to cleavage of a disulfide bond and produces a set of three peptides with a cysteine residue, a thiocysteine residue (+32Da), and a dehydroalanine residue (-34Da). This characteristic feature was observed from somatostatin and insulin by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Mass spectrometric observation of this triplet is useful in identifying the presence of a cystine residue in a peptide, and could assist mass spectrometric identification of the peptide from a database. Copyright (C) 2001 John Wiley & Sons, Ltd.N
EFFECT OF RADIATION ON DIFFUSION FLAME BEHAVIOR OVER A COMBUSTIBLE SOLID
No full textThe effects of two-dimensional gas radiation on the flame behavior over a solid fuel plate are explored. The theoretical model includes the elliptic type of momentum, energy and species equations with a second-order single-step chemical reaction model of the Arrhenius type. The discrete ordinates method is employed to solve the radiative transfer equation. Numerical calculations are performed for a wide range of mass absorption coefficients and wall emissivities to characterize the flame behavior. When the gas radiation is stronger, the radiative heat loss causes the flame to retreat downstream, causes shrinkage of the flame size, and causes a decrease in the maximum flame temperature. The flame configuration is thus strongly affected by the gas radiation process.It is our pleasure to acknowledge support for this work from the Korean Agency for Defense Development under the Long-Range Fundamental Research Fund (Project monitor; Dr Jong Wook Kim)
Full numerical estimation of neutrino mixing parameters from solar neutrino data
No full textX11sciescopu
Suppression of matrix clusters and enhancement of peptide signals in MALDI-TOF mass spectrometry using nitrilotriacetic acid
No full textMatrix clusters and their alkali metal ion adducts suppress peptide signals in the 500-1400 Da range and compromise MALDI-TOF mass spectrometric peptide mass fingerprinting and protein identification. Addition of 7 mM nitrilotriacetic acid to the matrix solution significantly reduced matrix clusters and increased signal-to-noise ratio of peptide signals similar to 5 to 20-fold. As a result, reliability in the identification of femtomole amounts of proteins based on peptide mass fingerprinting and database search was significantly enhanced, leading to a higher score and sequence coverage.N
Effects of distance between pads on the inlet pressure build-up on pad bearings
No full textFull Navier-Stokes equations are solved numerically for a cavity region between two consecutive pads and a parallel lubricating film. Numerical solutions art, obtained for a wide range of Reynolds number and various values of a distance between pads. Numerical results show that the inlet pressure build-up is significantly affected by Reynolds number and the distance between two adjacent pads, A new formula is derived of loss coefficient with Reynolds number and a distance factor, for using it in an extended Bernoulli equation, on the basis of numerical results. Experiments art conducted to investigate the validity of the formula of loss coefficient proposed by authors
Characterization of Ca-Bi-Mo oxide catalyst for selective propane ammoxidation, using XRD, XPS, TPRX/TPRO, and IR/Raman
No full textThe physicochemical properties of highly active and selective Ca-Bi-Mo oxide for ammoxidation of propane to acrylonitrile were investigated by XRD (powder), IR/Raman, XPS, and TPRX/TPRO (temperature programmed reaction/temperature programmed reoxidation) techniques. It was found that the phases in the Ca-Bi-Mo oxide varied with the composition of the oxide. The modified gamma-bismuth molybdate (gamma-Bi2MoO6) and defective Ca-Bi-Mo phases produced by addition of Bi oxide played an important role in propane ammoxidation to acrylonitrile. XPS results revealed that the mole ratio of elements on the surface was different from that in the bulk. The concentration of bismuth decreased from the surface to the inner layer of CaxTBi2-xMo12 oxide, while the concentration of calcium increased from the surface to the inner layer. The Ca-Bi-Mo oxide showed good catalytic performance when an appropriate amount of calcium oxide was present on the surface along with Bi and Mo oxides. The addition of Ca oxide into Bi-Mo oxide decreased the number of active sites for complete oxidation and increased the ability of reoxidation (O-2 consumption) of reduced catalysts.This research was funded by Tong-Suh
Petrochemical company and CUPS (Center for Ultra-microchemical
Process Systems) sponsored by KOSEF (2003-2004).
The authors thank Professor I. Wachs and Dr. D. S. Kim for
their help in obtaining the Raman spectra
Binary motion estimation with hybrid distortion measure
No full textThis paper proposes a new binary motion estimation algorithm that improves the motion vector accuracy by using a hybrid distortion measure. Unlike conventional binary motion estimation algorithms, the proposed algorithm considers the sum of absolute difference (SAD) as well as the sum of bit-wise difference (SBD) as a block-matching criterion. In order to reduce the computational complexity and remove additional memory accesses, a new scheme is used for SAD calculation. This scheme uses 8-bit data of the lowest layer already moved into the local buffer to calculate the SAD of other higher binary layer. Experimental results show that the proposed algorithm finds more accurate motion vectors and removes the blockishness of the reconstructed video effectively. We applied this algorithm to existing video encoder and obtained noticeable visual quality enhancement
Critical current densities and flux creep rates in near optimally doped BaFe2-xRuxAs2 (x approximate to 0.7) single crystals
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